ratty
I'm not special I'm limited edition
Exhaust gas recirculation valve. Depends what engine you have as not all engines have em. Some say yes, some say no. I get shot of em on my own vehicles whenever possible and have suffered no ill effects because of it.
chromiumuk
Well-Known Member
It stands for exhaust gas recirculation & is a vacuum operated valve which operates at lighter throttle openings & lets some of the exhaust gases mix with the inlet airflow. The main reason this is done is to reduce the nitrogen oxides etc which are formed during higher temperature/leaner mixture combustion. Unfortunately mixing old stale exhaust fumes with fresh air before putting it into the engine does nothing to help performance, economy or efficiency so many on here myself included have fitted an egr bypass in place of the valve to prevent this from happening. The only downside is that exhaust temperatures can become a little hotter which on some cheaper brands of car e.g. Renault can be a problem for the turbo chargers but on the Td4s BMW engine this is not an issue. This does not affect the emmission readings for the MOT as they only measure for carbon particulates, indeed these should be improved now that fresh air only is being put through the engine.
Medusa
Well-Known Member
Excellent summary chromiumuk, I've done the same on my Golf. This has smoothed out tickover and pickup and increased my mpg slightly.
chromiumuk
Well-Known Member
I think that's more proof that this is a good worthwhile mod to make though I know not everyone is convinced.
